5643f6f396
The standard only specifies that barrier::arrival_token is a move constructible and move assignable type. We originally used a scoped enum type, but that means we do not diagnose non-portable code that makes copies of arrival tokens (or compares them for equality, or uses them as keys in map!) This wraps the enum in a move-only class type, so that users are forced to pass it correctly. The move constructor and move assignment operator of the new class do not zero out the moved-from token, as that would add additional instructions. That means that passing a moved-from token will work with our implementation, despite being a bug in the user code. We could consider doing that zeroing out in debug mode. libstdc++-v3/ChangeLog: * include/std/barrier (barrier::arrival_token): New move-only class that encapsulates the underlying token value. |
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